linux-kernel - Re: [PATCH] regulator: wm8994: Use PROBE_FORCE

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Message-ID: <beeef631-943a-40db-af09-753c96b5b140@sirena.org.uk>
Date:   Thu, 23 Mar 2023 17:49:28 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     Doug Anderson <dianders@...omium.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        Liam Girdwood <lgirdwood@...il.com>,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH] regulator: wm8994: Use PROBE_FORCE_SYNCHRONOUS

On Thu, Mar 23, 2023 at 05:45:31PM +0000, Charles Keepax wrote:

> I think really the best place to look at this would be at the
> regulator level. It is fine if mfd_add_devices passes, the problem
> really is that the regulator core doesn't realise the regulator is
> going to be arriving, and thus returns a dummy regulator, rather
> than returning EPROBE_DEFER. If it did the MFD driver would probe
> defer at the point of requesting the regulator, which would all
> make sense.

You need the MFD to tell the regulator subsystem that there's a
regulator bound there, or to force all the users to explicitly do the
mapping of the regulator in their firmwares (which isn't really a
viable approach).

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